Cement reversing out tool for casingless completions



R. s. HOCH 3,185,218

CEMENT REVERSING OUT TOOL FOR CASINGLESS COMPLETIONS May 25, 1965 3Sheets-Sheet 1 Original Filed Jan. 25, 1960 INVENTOR. R. S. HOCH A TTORNEKS May 25, 1965 R. s. HOCH CEMENT REVERSING OUT TOOL FOR CASINGLESSCOMPLETIONS Original Filed Jan. 25, 1960 3 Sheets-Sheet 2 \n\.. W w 00 MH R W. m R z N 5 F W w fl m 0 7 0 0 l B "0 w 2 8 Q R. s. HOCH 3,185,213

CEMENT REVERSING OUT TOOL FOR CASINGLESS COMPLETIONS May 25, 1965 SSheetS-Sheet 55 Original Filed Jan. 25. 1960 a a O l 2 9 m M m P E H a 2W 8. HG 6 S E F MR w 5 7, H 7 Q ////ul/ 2 r ,K, AA w nmwmmmmm m a a b O2 9 7 M 9 w w 2 x in? %W a 6 r w \-l t I d h w 8 d/l/l/ n o. g 23% 1.

FIG. 7

A TTORNEYS United States Patent 3,185,218 CEMENT REVERSlNG GUT T901. FURCASINGLES COMRLETIQNS Robert S. doch, Bartiesville, Olden, assignor toPhillips Petroleum Company, a corporation of Delaware Griginalapplication Jan. 25, 196i}, Ser. No. 4,537, new Patent No. 3,086,592,dated Apr. 23, 1963. Divided and this application 5211. 25, 1963, Ser.No. 253,869

6 Claims. (El. 166-456) This invention relates to casingless, multiplecompletion deep wells. In one aspect it relates to completion ofcasingless deep wells for the production of fluid from two or morefluid-bearing horizons. In another aspect it relates to a cementingvalve structure which will permit pumping cement downward through bothtubing strings of a dual production well. In still another aspect itrelates to a cementing valve structure which will permit pumping cementdown all of the tubing strings and at the same time will permit openingof a communication port between the strings of tubing to permit Washingof the tubing strings.

This application is a division of application S.N. 4,537 filed January25, 1960, now Patent No. 3,086,592.

In casingless, multiple completion wells, to my knowledge, cement hasbeen pumped down only one of the tubing strings. Pumping cement downwardthrough long lengths of a single tubing string is a slow operation. Suchpumping of cement for filling a borehole between one or more tubingstrings and the walls of the well requires considerable power over longperiods of time. According to this invention, cement can be pumpedthrough two or more strings, thereby markedly shortening pumping time.

An important object of this invention is the provision of appanatus forthe washing of cement from the inner surfaces of the tubing stringsafter cement has been pumped downward through two or more tubingstrings. Another object of this invention is to provide apparatus forreducing the cost of completing multiple completion oil wells byshortening the length of time for carrying out the cementing operations.Another object of this invention is to provide apparatus for washing theinterior of two or more tubing strings free of cement so as to maintaintheir original diameters for production of the fiuid from severalformations with minimum of pressure loss. Other objects and advantageswill be realized upon read ing the following description which, takenwith the attached drawing, forms a part of this specification.

In the drawing:

FIGURE 1 is an elevational view, in section, of a dual completion wellin which the apparatus of this invention is employed.

FIGURE 2 is an elevational view of apparatus illustrating anotherembodiment of my invention.

FIGURE 3 is an elevational view illustrating still another embodiment ofmy invention.

FIGURE 4 is an elevation-al view illustrating a piece of equipmentuseful with my invention.

FIGURE 5 is an elevational View, partly in section, of one embodiment ofcement reversing tool of my invention.

FIGURE 6 is an elevational view, partly in section, of anotherembodiment of cement reversing tool of my invention.

FIGURE 6a is a sectional view taken on the line 6ac"a of FIGURE 6.

FIGUl ES 7 and 8 are elevational views, in section, of still otherembodiments of my invention.

Referring to the drawing, and specifically to FIGURE 1, the-re isillustrated a pair of tubing strings extending from a wellhead 1? to thebottom of a borehole 11a. These two tubing strings are identified byreference nu- 3,185,2l8 Patented May 25, 1965 lice metals 11 and 12.These strings terminate at the bottom of the well in a guide shoe-backpressure valve-reversing out tool 21 of this invention. In thisparticular embodiment fluid is intended to be produced from a lowerformation 13 and from an upper formation 14 through perforations 15 and16, respectively. A landing nipple 18 is provided in tubing string 11 ata level between the formations 13 and 14, as illustrated. If desired, alanding nipple 18 can also be installed between these formations intubing string 12. In this manner production from either formation can bedirected through either of the tubings as desired and the other tubingsealed oil. For example, when production from formation 13 is desiredthrough tubing 11, landing nipple 18 is installed in tubing 12 at alevel between the two formations and a blanking plug, not shown, isinstalled in the nipple. The tubing 12 is then perforated adjacent theproducing formation 14 for production therefrom. Nipple 18 with blankingplug in tubing 12 is positioned between the two formations for thepurpose of preventing fluid from formation 13 from flowing downward intubing 11, through the reversing out tool 21 and upward in tubing 12 tobe mixed with fluid from formation 14. Likewise, the blanking plug inlanding nipple 18 in tubing 12 prevents fluid flow from formation 14 inthe reverse direct-ion into tubing 11. Tubing clamps 2d are well knownin the art and are employed to maintain the tubings in spacedrelationship with one another while being run into the well and duringthe cementing operations. These tubing clamps are usually employed atpredetermined intervals from the bottom of the well to the groundsurface.

In FIGURE 2 is illustrated a well completion for a dual production wellin which one tubing string reaches the bottom or substantially thebottom of the well and the other tubing string terminates at a levelbetween the two toil-bearing formations. Tubing string 17 is the longtubing reaching the well bottom while tubing 2.7 is the short oneterminating between the two formations. A circulating mandrel 22, shownin detail in FIGURE 7, connects the bottom of tubing string 27 with thetubing string 17. A landing nipple 18 is provided in tubing string 27 ata level between the two oil-bearing formations so that a blanking plugcan be installed to prevent oil from formation 14 from mixing with oilfrom formation 13.

A guide shoe containing a back pressure valve 51 attached to the lowerend of reversing out tool 21, as illustrated in FIGURE 5, is suitablefor use as the guide shoe and back pressure valve 23 of FIGURE 2.

In FIGURE 3 is illustrated an installation of three strings of tubingsuch as are employed in a multiple completion well for production fromthree separate formations. A guide shoe and back pressure valve 23 isattached to the lower end of the longest string of tubing illustrated inFIGURES 2 and 3. In FIGURE 3 the tubing string 3% extends from thewellhead to substantially the bottom of the well, tubing string 29extends to a level between the lower oil-bearing formation 13 and anintermediate oil-bearing formation 24. Tubing string 31 extends downwardto a level between the intermediate formation 24 and the upper formation14. A circulating mandrel 28, similar to mandrel 22 of FIGURE 2,connects the bottom end of tubing 29 with tubing 30 while a circulatingmandrel 25 is connected with the bottom of tubing 31 and communicateswith tu'bings 2h or 30 at a level between the upper and middleformations. Tubing 29 is perforated at 26 for production of fluid fromformation 24. The mandrel 25 is constructed along the same lines asmandrels 22 and 28. Landing nipple 18 is installed in tubing 30 abovemandrel 23 and formation 13 so that in case formation 13 is ever to beblanked oil? it can be done. A landing nipple is installed in tubing 29at a level between formation 24 and the mandrel 28 to prevent mixing offluids from formations 13 and 24. Similarly, a landing nipple 18 isinstalled in tubing 31 at an elevation above formation 14 in caseproduction from formation 14- is ever to be blocked off. Additionallanding nipples are installed in tubings 2.9 and St) at an elevationbetween formations 24 and 14 so that, if desired, formation 14 can beproduced to the exclusion of products from formations 24 and 13.

In the several figures as given herein, in a dual completion well thecementing pump outlet is manifolded to the .two well tubings so that thepump will pump simultaneously into the tubings. In case of a triplecompletion well the cementing pump outlet is manifolded to the threetubing strings so as to pump simultaneously into the three tubingstrings. If desired, more than one cementing pump can be used. In such acase the several pumps are manifolded to the several tubings.

FIGURE illustrates one of the embodiments of the guide shoe-backpressure valve-reversing out tool of my invention. This tool comprises aspring-loaded back pres sure valve 51 positioned axially therein. Thepurpose and operation of cementing back pressure valves is wellunderstod by those skilled in the art. The valve is supported at thelower end of tubular housing 52 which incloses the remainder of thisapparatus. In the upper portion of housing 52 is disposed a pair ofconduits 62 and 62a, positioned as illustrated. Within these conduitsare positioned sleeves 53 and 53a which are held in position by shearpins 56 and 56a, respectively. Separating conduits 62 and 62a is apartition or wall 63 provided with an opening or port 61, asillustrated. At the upper ends of the walls of conduits 62 and 62a areprovided threads or other means for attaching tubings 12 and 11.Recesses 54 and 54a are provided in sleeves 53 and 53a, respectively, asshown. Also, expansible snap rings 57 and 57a are provided, as shown.O-ring seals 55 and 55a prevent leakage between the sleeves and thewalls of these conduits. Near the lower ends of conduits 62 and 62a areprovided recesses 59 and 5%, respectively, the lower ends of whichterminate as seats 66 and 60a. Seats 58 and 58a are provided forreceiving in a fluid-tight manner a corresponding seating surface 44from a cementing plug 41, as illustrated in FIGURE 4.

This cementing plug illustrated in FIGURE 4 comprises flexible wiperrings or cups 42, seating surface 44 and collet lock members 43. Plug41, when pumped down tubing 12, reaches the sleeve 53 with the collets43 entering the recess 54, thereby locking the plug adjacent the sleeve.

In the operation of the apparatus of FIGURE 5, cement is pumped downboth strings of tubings 11 and 12. When sufiicient cement has beenpumped into both strings,

a separate cement plug, similar to plug 41, is released in each of thetubing strings simultaneously. While the plugs are released at the sametime, they do not necessarily reach the sleeves 53 and 53:: at the sametime. For explanation purposes, when the plug in tubing 12 reaches thesleeve 53, fluid can no longer be pumped into tubing 12 and at thisinstant pump pressure increases. When the plug seats against seatingsurface 58 in sleeve 53, the increase of pressure differential causesshear pin 56 to shear, with the result that sleeve 53 moves downwarduntil its lower end contacts shoulder 60 at which position theexpansible snap ring 57 expands into recess 59 thereby locking sleeve 53in its lower position. The passage of sleeve 53 downward openstheadjacent end of port 61.

In due time the second plug reaches the lower end of tubing 11 and seatsagainst seating surface 58a with the collets of the plug entering recess54a, thereby locking this plug adjacent sleeve 53a. Continued pumppressure shears pin 56a after which action the sleeve moves downwarduntil its lower end contacts seat 60a. The expansible ring 57a expandsinto recess 59a thereby locking this sleeve in this position. Whensleeve 53a becomes lowered in this manner, its end of port 61 is openedthereby providing communication between tubings 11 and 12.

When the sleeves 53 and 53a are in the lowered positions, sufiicientcement has been extruded around check valve 51 for cementing the welland, upon release of well head pressure, check valve 51 seats and thecement is allowed to set. However, while the cement around the tubingsin the well bore is setting, drilling fluid or mud, or other liquid suchas water, is circulated down one of the tubings through port 61 and upthe other tubing to wash out any cement adhering to the walls of thetubings. When this washing out operation is completed, the washingliquid can be removed by displacing clean water, oil or a perforatingluid or may even be displaced with air or other gas and blanking plugsset in the landing nipples at the required levels. The tubings are thenready for perforations adjacent the formations and the well is ready fordual production.

In FIGURE 6 tubings 11 and 12 are attached to the upper ends of thewalls surrounding conduits 7t and 69, respectively, in the same manneras in FIGURE 5. A partition or wall 76 separates conduit 69 from 70within housing of this embodiment of the reversing out tool. A movablesleeve 74 is provided for downward movement within housing 75. O-rings78 and 79 seal space between the sleeve 74 and the walls of housing 75to prevent leakage of fluid therebetween. An expansible bevel snap ring80 is provided as illustrated. This ring is provided, as its nameimplies, with a bevel surface 80a so that upon exerting a downward forceon the ring in the position illustrated in the drawing, the ringcontracts thereby allowing the sleeve to move downward. When the sleevemoves downward a sufiicient distance, it expands into a recess 82 andlocks thesleeve in place. When in this lower position with ring 80locked into recess 82, a back pressure valve seat 73 at the bottom ofthe sleeve seats against the sealing surface 73a of a spring-loaded backpressure valve 72. A guide shoe of this embodiment, within which is aback pressure valve, is identified by reference numeral 71. At the upperends of the sleeve 74 are provided seat members 7% and 79a on respectiveupper surfaces of which are beveled seats 77 and 77a for accommodationof cementing plugs similar to the plug of FIGURE 4.

1n the operation of this embodiment of the apparatus the reversing outtool and guide shoe assembly are installed on the bottom of tubings 11and 12 and the tubings are then run into the borehole. Cement is thenpumped down tubings 11 and 12 until such time as it is believed thatsulficient cement has been added; then cementing plugs are placed in thetubings and pressured downward by drilling fluid or other liquid. Forexplanation purposes, I will assume that the cementing plug reachesconduit 69 first and the plug seats against the seating surface 77. Thispoint of operation is noted by an increase in pump pressure. Upon notingthis increase of pump pressure the pumping rate is cut to about half orless so that the sleeve 74 will not move downward until after the secondplug reaches the lower end of tubing 11 and seats against surface 77a.At this time pump pressure again increases and the bevel ring 80contracts because of the bevel shoulder 80a, and the sleeve movesdownward until the valve seat 73 reaches the upper sealing surface 73aof the back pressure valve 72. Slight further downward movement ofsleeve 74 closes the annular opening around valve 72 and allows snapring 80 to lock in recess 82. At this time conduit 69 communicates withconduit 79 below the lower end of wall 76. With this communicationbetween the two tubings established, the interior walls of the tubings11 and 12 are cleared of cement by circulation of water or other liquiddown one tubing under the end of wall 76 and up the other tubing.

In FIGURE 6a seating members 79b and 79a with plug seating surfaces 77and 77a, respectively, are shown. Opening 73b above the back pressurevalve seat is seen.

In FIGURE 7 tubings 17 and 27 are illustrated as being attached to theupper end portion of housing 92. Conduits 89 and 90 communicate with theinterior of tubings 17 and 27, respectively. Within conduit 89 isdisposed a sleeve 93 provided with an O-ring seal 99, a shear pin 100,and an expansible snap ring 101. This snap ring is provided at spacedintervals around its inner surface with one or more pins 105 whichextend into corresponding openings in the outer wall of an inner sleeve95. This inner sleeve 95 is positioned within sleeve 93 as illustratedand it contains a recess 98. Below the lower end of sleeves 93 and 95 isprovided a recess102, the lower end of which is provided with a seatingsurface 107. A portion'of this seating surface 107 is provided by theupper end of the shell or body member of circulating mandrel 22 which isthreaded into the lower end of housing 92. As illustrated, the upper endof this circulating mandrel provides a seating surface of sufficientlysmall diameter for a purpose as subsequently described.

Conduit 90 within housing 92 is provided with a sleeve 94 which is heldin position by a shear pin 100a, as illustrated. Shear pin 100a requiresa smaller force for shearingtha-n the above mentioned shear pin 100. Anexpansible ring 102b is provided for expanding into a recess 102awhenever sleeve 94 moves downward to such an extent that its lower endsurface contacts seating surface 10701. A wall 103 divides conduit 89from conduit 90 at the lower ends thereof. A port 106 is provided inWall 103 in such a position that when sleeves 93 and 94 are moveddownward, the port provides communication from tubing 17 to tubing 27. I

In the operation of this embodiment of this invention, when sufiicientcement has been pumped into the two strings of tubing, a cementing plugis inserted into each tubing and the plugs are forced downward. One plugwill land first because the rate of fluid entry into the two tubings isnot necessarily the same. When the first plug lands, for example, onsleeve 93, the collets lock into recess 98 and the circulation pressureincreases. The pump or pumps are slowed down to less than half theirprevious displacement rate in order not to shear pin 100. When the otherplug reaches sleeve 94 the collets of this plug lock in recess 98a andliquid is trapped above both plugs and additional pumping will shear theweaker pin 100a first, and then the stronger pin 100. When pin 100ashears, sleeve 94 moves downward until it reaches shoulder 107a. Snapring expands into recess 102a. Following this seating of sleeve 94 withits plug, shear pin 100 shears and sleeves 93 and 95 move downwardtogether. expands and pins 105 move out of sleeve 95 and this sleeve isthen freed for further downward movement. Upon downward movement ofsleeve 95 in tubing 104, with its plug locked in place, the sleevefinally seats and the plug serves as a conventional cement plug. Aftersleeve 95 and its cementing plug have reached bottom in tubing 104,water or other liquid is circulated down one tubing string, 17 or 27,and up the other to wash out residual traces of cement. Communicationbetween tubings 17 and 27 is by way of port 106 which was opened whensleeves 93 and 94 moved downward. A conventional cementing shoe and backpressure valve (not shown in FIG. 7) is provided at the bottom of tubing104 similar to that illustrated in FIGURE 3.

In FIGURE 8 the embodiment illustrated resembles, to some extent, theapparatus of FIGURE 7 and also the apparatus of FIGURE 6. The fitting orhousing 111 is similar to the corresponding part of fitting 91 of FIGURE7, while the slidable member or sleeve 113 resembles somewhat sleeve 74of FIGURE 6.

In FIGURE 8 conduits 109 and 110 are separated in the upper part ofhousing 112 by a wall 126. Below Wall 126 and in the absence of sleeve113, conduits 109 and 110 enter a single enlarged conduit. Sleeve 113 ispro- When snap ring 101 reaches recess 102 the ring 7 vided with anO-ring seal 117 in conduit 109 and an O-ring seal 117a in conduit 110.Shear pins 120 and an expansible snap ring 121 are provided as shown. Onthe opposite side of the sleeve 113 the expansible ring 121 is shownwithout a pin 122. This pin 122 is intended to hold into position aninner sleeve 114, as illustrated. This inner sleeve is provided with aplug seating surface 115 and a recess 118 for accommodation of colletsfrom a cementing plug similar to the plug of FIGURE 4. The opposite sideof sleeve 113, having conduit 110 there through, is provided with arecess 118a.

On the lower outer surface of sleeve 113 is a bevel surface 124 forseating against a mating bevel surface 125, as illustrated. Theoperation of the apparatus of this figure is quite similar to theoperation of the apparatus in FIGURE 7. If the cementing plug reachesconduit 109 through tubing 30 ahead of the plug in tubing 29, thecollets then enter recess 118 and the plug seats against surface 115. Atthis time pump pressure increases and the pumping rate is reduced sothat pins 120 will not be sheared. Upon continued pumping at this slowerrate, the cementing plug from tubing '29 finally reaches conduit 110 andthe collets enter recess 118a and the plug seats against surface 116. Atthis time pump pressure increases again and pins 120 shear therebyallowing the sleeve 113 to move downward until the bevel surface 124contacts surface 125. During the downward movement of sleeve 113 theexpansible ring 121 reaches recess 127 and expands thereinto to such anextent that pin 122 frees sleeve 114. When this sleeve has been'freed,then upon continued exertion of pump pressure, the plug forces sleeve114 downward and into a lower tubing 128 corresponding to the lowerportion of tubing 17 'of FIG URE 2. Pumping is continued until sleeve114 and its accompanying plug reach the guide shoe and back pres surevalve 23, as illustrated in FIGURE 2. Tubing 30 and the tubing section128 are thus freed of cement and upon release of pump pressure the backpressure valve within apparatus 23 seats to prevent inflow of cementfrom the well bore. 7

With the slide 113 having been moved downward, communication is providedbetween tubings 29 and 30 by way of an open space below the lower end ofwall 126. All traces of cement are thus removed from the inner walls oftubings 29 and 30 by circulation of water, drilling fluid or otherliquid. After the tubings are washed clean of cement and the cement hasset in the space in the well bore between the tubings and the walls ofthe well, blanking plugs can be installed at the proper levels adjacentwhich are positioned landing nipples, and the tubings perforated at theproper levels. The well is then ready for I production.

The length of wall 63, FIGURE 5, below port 61 is suificiently long thatwhen the bottom ends of slides 53 and 53:; contact seating surfaces 60and 60a the corresponding plugs are below port 61 so that there can befree and unobstructed flow through this port. The same condition isintended to exist below port 106 of FIGURE 7. In FIGURE 6 it is intendedthat sleeve 74 with plugs in contact with surfaces 77'and 77a movedownward a sufliciently great distance to provide free and unobstructedflow path below the lower end of wall 76. The same condition is intendedto exist in FIGURE 8 so as to provide an unobstructed and free fiow pathunder the lower end of wall 126.

While certain embodiments of the invention have been described forillustrative purposes, the invention obviously is not limited thereto.

I claim:

1. A valve structure comprising, in combination, a body member having apair of inlet conduits the axes of which are ventically positioned; awall separating said conduits from each other; a third and outletconduit 7 below said wall providing a passageway -from one inlet conduitto the other; a slidable sleeve member extending from said outletconduit into the inlet conduits and upward beyond the lower end of saidwall and closing said passageway except thru said sleeve, the ends ofsaid sleeve member extending into the inlet conduits being provided withvalve seating surfaces; a separate valve plug insertable in each inletconduit and positionable on said seating surfaces, the valve plugs beingadapted upon exertion of fluid pressure downward upon the plugs to seatagainst said seating surfaces and force said sleeve member downwardbeyond the lower end of said wall thereby opening said passageway belowthe lower end of said wall from one inlet conduit to the other; andpressure releasable means holding said sleeve member in the positiondescribed. a

2. A valve structure comprising, in combination, a body 7 said seatingsurfaces, said slidable sleeve member having an opening in its lower endproviding communication from said body member below said sleeve memberto said pair of inlet conduits; a back pressure valve head in saidoutlet conduit; a valve seat onthe lower end of said slidable sleevemember around said opening and facing said valve head, said valve plugsbeing adapted upon exertion of fiuid pressure downward upon the plugs toseat against said seating surfaces and force said sleeve member downwardbeyond the lower end of said wall thereby opening said passageway belowthe lower end of said wall from one inlet conduit to the other and toseat said ,valveseat against said valve head thereby closing said backpressure valve; and pressure releasable means holding said sleeve memberin the position described. i

3. A valve structure comprising, in combination, a body member having afirst and a second inlet conduit the axes of which are verticallypositioned; a wall separating the conduits from each other; a third andoutlet conduit below said wall providing a passageway from one inletconduit to the other, said third conduit being positioned along the axisof the first conduit; a slidable sleeve member extending from saidoutlet conduit into the inlet conduits and upward therein beyond thelower end of said wall and closing said passageway, said sleeve memberhaving a first opening along the axis of said first and third conduitsand a second opening along the axis of said second conduit; a slidablesleeve in said first opening, the upper end of said slidable sleeve andthe upper end of said sleeve member surrounding said second openingbeing provided with surfaces for seating valves; first and second valveplugs insertable in said first and second inlet conduits above saidsleeve member; an annular shoulder around the inner wall of said outletconduit, said shoulder facing generally upward and being adapted toserve as a valve seat, the lower end of said slidable sleeve membercomprising a valve head adapted to seat operably against said valveseat, said valve plugs being adapted upon exertion of fluid pressurethereon to move said slidable sleeve member downward thereby seatingsaid valve head against said valve seat thereby opening said passagewaybelow the lower end of said wall from one inlet conduit'to the otherinlet conduit; aback pressure valve in said third conduit positionedremote from adjacent ends of said inlet conduits and, further, saidfirst plug being adapted upon exertion of further fluid pressure thereonto move said slidable sleeve from said sleeve member through said thirdconduit to said back pressure valve; pressure releasable means forholding said sleeve member in, the described position; and means forholding said inner sleeve in the described position in said sleevemember and releasing same when said sleeve member is moved to itslowermost position.

4. A valve structure comprising in combination, a tubular body memberhaving a pair of inlet conduits parallel with the axis of said bodymember at one end and an outlet conduit at the other end; a wallseparating said inlet conduits from each other, said inlet conduitsbeing connected by a passageway below said wall; a slidable sleeveextending into said body member from said outlet conduit provided with atubular section slidably extending into each said inlet conduit andclosing said passageway except thru said sleeve; a separate valve seaton the outer end of each said tubular section adapted to seat'a valveplug to which fluid pressure is applied to force said sleeve memberinwardly from said inlet conduits beyond said wall so as to open saidpassageway to flow from'one inlet to the other; and pressure releasablemeans for holding said sleeve in position closing said passageway.

5. The valve structure of claim ,4 including a back pressure valve headin said outlet conduit spaced from said sleeve; and an axial valve seaton the end of said sleeve adjacent said outlet conduit which closes saidoutlet conduit upon movement of said sleeve beyond said wall. I

6. The valve structure of claim 3 wherein said means for holding saidinner sleeve in said sleeve member and releasing same comprises a snapring encircling said member in a groove therein biased outwardly, andprovided with a pin extending thru said member into said inner sleeve;and a groove in said body member below said ring when said sleeve is inthe described position.

References Cited by the Examiner UNITED STATES PATENTS 2,846,014 8/58Dafiin et al. a l66-224 X 2,852,079 9/58 Hebard 166147 2,923,357 2/60Dafiin 166-46 X 2,939,533 6/60 Coberly 166-68 CHARLES E. OCONNELL,Primary Examiner.

1. A VALVE STRUCTURE COMPRISING, IN COMBINATION, A BODY MEMBER HAVING APAIR OF INLET CONDUITS THE AXES OF WHICH ARE VERTICALLY POSITIONED; AWALL SEPARATING SAID CONDUITS FROM EACH OTHER; A THIRD AND OUTLETCONDUIT BELOW SAID WALL PROVIDING A PASSAGEWAY FROM ONE INLET CONDUIT TOTHE OTHER; A SLIDABLE SLEEVE MEMBER EXTENDING FROM SAID OUTLET CONDUITINTO THE INLET CONDUITS AND UPWARD BEYOND THE LOWER END OF SAID WALL ANDCLOSING SAID PASSAGEWAY EXCEPT THRU SAID SLEEVE, THE ENDS OF SAID SLEEVEMEMBER EXTENDING INTO THE INLET CONDUITS BEING PROVIDED WITH VALVESEATING SURFACES; A SEPARATE VALVE PLUG INSERTABLE IN EACH INLET CONDUITAND POSITIONABLE ON SAID SEATING SURFACES, THE VALVE PLUGS BEING ADAPTEDUPON EXERTION OF FLUID PRESSURE DOWNWARD UPON THE PLUGS TO SEAT AGAINSTSAID SEATING SURFACES AND FORCE SAID SLEEVE MEMBER DOWNWARD BEYOND THELOWER END OF SAID WALL THEREBY OPENING SAID PASSAGEWAY BELOW THE LOWEREND OF SAID WALL FROM ONE INLET CONDUIT TO THE OTHER; AND PRESSURERELEASABLE MEANS HOLDING SAID SLEEVE MEMBER IN THE POSITION DESCRIBED.